The only ways for Survival: Endless to end are by getting the player's brains eaten or if they reset. After 214,748,366 flags, the game will go to -214,748,363 flags (due to an integer overflow), and the flag number will only show during the intermission every two flags. At -107,374,181, only flag zombies will show up, until -1 flags, where Survival: Endless will be like normal. You can download this as nice desktop wallpaper by right click and save as into your computer.
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This level is mainly a challenge of surviving as many flags as the player can, and will become very difficult as the player completes more flags. Just like all Survival: Hard levels and Last Stand Endless, the player can choose new plants when two flags are completed.